What is Kantan Session-kun?
Kantan Session-kun is a web app that lets anyone jam along with music — whether you're playing by yourself or in a real session with others.
No pitch sense, instruments, music theory, or special skills needed.
Just pick a key, start playing, and have fun!
How to use Kantan Session-kun?
Search for a song you want to jam to.
Try adding keywords like "karaoke" or "instrumental" to get better results.
You'll see a list of YouTube videos based on your search.
Click Check key on Tunebat to find out the key of the song.
If it doesn't work, click Find key to figure it out from the chords.
(Hint: The last chord of the chorus is often the key.)
If you can't find the chords, try humming along to identify the key.
From any phrase in the song, hum the note that feels like a natural resting point or resolution.
That note is likely the tonic — the key of the song.
Symphonic Gems: Tchaikovsky - The Nutcracker - Waltz of the Flowers | Concertgebouworkest Pick the key you found in step 3, then choose a video to jam with from the list.
The video will start playing automatically.
Start jamming!
Just play around on your keyboard and enjoy the session.
Features of Kantan Session-kun
- Search for YouTube videos
- Play the lead part
- Adjust volume of the lead part
- Links for automatic key detection
- Links to search for chords
- Manually select key
- Toggle between Simple and Flexible jamming modes
- Built-in sound effects
Tips for jamming with Kantan Session-kun
Playing the root note at the end of a section can help your phrases feel more complete and grounded.
For example, if the song is in C, try ending your phrase on C.
If it's in G#m, end on G#m for a nice sense of resolution.
Is Kantan Session-kun free to use?
Yes — it's completely free!
No account needed.
Just open the app and start jamming right away.